At Pure Black World Tendency; killed Primeval Demon (+3) and went to Nexus. Then 3 deaths (-3) spawned BP Scirvir.

At Pure Black World Tendency; killed BP Scirvir (+3) and went to Nexus. Then 2 deaths (-2) should have spawned the Primeval Demon according to Wiki Reference, but had to die one more time (-3) for it to appear.

So killing BP Scirvir actually gives an estimated +3.5 towards White.

Atlus wiki suggests the change from black to pure black is only a 10% change, while a death in Body Form equates to 30% (-1). Killing him should push the wt 90% towards neutral (+3), and then two deaths (-2) was only 5% short of making the Primeval Demon spawn.

At Pure White World Tendency; Killed Selen Vinland (-3), then defeated Dirty Colossus (+1) and Maiden Astraea (+1), and was back at Pure White World Tendency.

This should have left me at White, not Pure White.

I have seen others mention that a boss kill (not world 1) is a 45% shift (+1.5), while killing a named NPC is a 90% shift (-3), which adds up.

I ordered a copy of the unpatched Asian version from play-asia (thanks for the suggestion!) and certainly the soul glitch works fine, but dying in soul form has NO apparent effect on World Tendency. I'd suicide, go back to Nexus, back to the world (Boletaria) get killed again, back to Nexus, at least 8 times with no apparent change in World Tendency according to the World Tendency display menu option. Surely I'd have noticed *some* difference! Someone obviously got the wrong info somewhere, and I figure I'll remove the note unless someone claims to have made it work with some *other* version. (I seem to have the Chinese version, as it came with the little folded insert of basic instructions in English.)

Tower of Latria World Tendency special note

The Tower of Latria is a special world for world tendency. The quickest way to achieve PWWT in one playthrough is to kill the black phantom NPC, the primeval demon, and a level boss. The problem with Latria is that there is a split between the first and second levels that cannot be crossed without returning to the Nexus. BP Lord Rydell is in 3-1, and the primeval demon is in 3-2. If a player kills the Fool's Idol Boss and proceeds to the second level, there is no way he can kill both Rydell and the primeval demon without returning to the Nexus. Since returning to the nexus resets WT, either Rydell or the P. Demon will no longer be visible.

The only way around this is to have pure black world tendency before killing the Fool's Idol. In short, to achieve PBWT and PWWT in one playthrough one must:

Achieve PBWT using stones of ephemeral eyes

Kill Rydell in 3-1

Kill Fool's Idol Boss

Kill Primeval demon in 3-2 (You will be in body form from killing Fool's Idol, but since WT does not reset it does not matter if you die here, the P. Demon will still be in the swamp)

If one dies in 3-2, killing the Maneater bosses will still put the world at PWWT

I find a bit confusing the fact that there's 4 neutral tendencies and to get from neutral to PW it's +3 but to PB it's -4. Also when trying to refer to any other tendency other than Pure it gets a bit tricky ,at least for me, so I thought I'd make a suggestion. There's 8 different tendencies so…

The world tendency shifts towards white when you kill a demon with a surviving blue phantom. This has always been the main way of gaining WWT. Why has this point been removed from "Towards White"? I cannot say about if resurrecting a blue phantom with Resurrection affects WT but I see no point in the miracle even existing if it didn't.
But killing a demon with phantoms that recover their body definitely raises WT.